As well as being known as a money-saving guru, Martin Lewis has also made a bit of a reputation for himself when it comes to being a social media personality.
His regular polls and witty personality have made him a big hit on Twitter, and even his non money-saving-related content always goes down a storm.
And his latest tweet is no exception, as it's blown our minds - and it could rival *that* dress colour debate.
Posting on Twitter, Martin shared a picture of a series of balls and stripes.
The picture caption read: "All the balls are the same color — and that color is *brown*!"
Martin added: "I'm totally amazed by this - I keep zooming in to see it. Superb design."
It wasn't long before people started to comment, with many appearing baffled by the illusion.
"I’m seeing green, purple and brown...or do I need my meds changing?" asked one confused Twitter user.
Another said: "Yes but not all the same shade of brown so I guess it's easier to achieve."
"Oh no makes me feel sick and awful headache!" said one Twitter user.
"This is so cool haha," wrote somebody else.
What do you see in the picture? Let us know by voting in the poll!
